package com.cyx.filter;

import com.cyx.utils.CurrentHolder;
import com.cyx.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 1、获取到请求路径
        String requestURI = request.getRequestURI();
        // 2、判断是否是登录请求，如果路径中包含/login，说明是登录操作，放行
        if(requestURI.contains("/login")){
            log.info("登录请求，放行");
            filterChain.doFilter(request,response);
            return;
        }
        // 3、获取到请求头中的token
        String token = request.getHeader("token");
        // 4、判断token是否存在，如果不存在，说明用户没有登录，返回错误信息 （响应401状态码）
        if(token == null || token.isEmpty()){
            log.info("令牌为空,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        // 5、如果token存在，校验令牌 如果校验失败 -> 返回错误信息 （响应401状态码）
        try{
            Claims claims = JwtUtils.parseToken(token);
            Integer empId = Integer.valueOf(claims.get("id").toString());
            CurrentHolder.setCurrentId(empId); // 存入
            log.info("当前登录员工ID: {},将其存入ThreadLocal",empId);
        }catch (Exception e){
            log.info("令牌非法,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        // 6、校验通过，放行
        log.info("令牌合法,放行");
        filterChain.doFilter(request,response);

        // 7、 删除ThreadLocal中的数据
        CurrentHolder.remove();
    }
}
